Tire mold



Sept. 15, 1925,

T. MIDGLEY TIRE MOLD Filed Aug. 31, 1923 citizen of the `United 'To all 'wko/m, 'it may concern.'

Patented Sept. l5, 1925.

THOMAS MIDGLEYLOF HAMPDEN MASSACHUSETTS coMrANY, oEcHIcorEE FALLS, SETTS.

TIRE

FICE'.

Application filed August 31, 1923. Serial No. 660,296.

Be it known that I THOMAS MIDGLEY, a

tates of America, residing at Hampden, in the county of Hampden and State of Massachusettshave invented certain new and useful Improve-l ments in a Tire Mold, of which the following is a specification.`

The present inventions relates to tire molds adapted for construction out of sheet metal and particularly intended for use in the vulcanization of automobile tire, casings under internal fluid pressure.

This invention is in the nature of a modiication of the mold shown and described in my copending application Serial No. 659,813, filed Aug. 28, 1923. The invention will now be described in connection with the accon'ipanying drawings in which Fig. Lisa sectional perspective view of a mold embodying the'invention; i

Fig. 2 is a Sectional view with. the parts separated; and

EFig. 3|is.a detail, partlybroken away, looking on line 3 3 of 1.

The mold comprises side plates 10 suitably shaped to the transverse curvature of the-sides of the tire, to be produced, and having flanges 11 whi'chlunderliethe bead portions 12 of the tire 13. Extending from theo'uter portions ofthe side'platestoward the cent-er or parting line kof the mold are tread forming strips 14, suitably perforated au15 andJ recessed at 16 to produce the desired treadl pattern, as `is fullyl describedl in themanner of forming the mold shown in my oopending application above referred to.y v`In the'enbodimet shownthe tread derSign, which it isfdesired to producehas a y'central rib shownin 1 at.` 17, which. is formedby the space in the mold between the tread forming strips 14.

Overlying the tread forming strips are cover plates 18 which close the perforations 15 in the tread forming Strips and' also Aextend to the parting line at the center of the, mold, thus bridging the gap between the treadyforming strips 14. Adjacent the partingilinel of the mold, plates' 18 have outj wardly extending flanges 19 which may be joined together to hold the mold assembled by aseries of U-shaped clips 20, arranged 'around the periphery of the moldA and attached to one of the flanges 19 as by a i screw or rivet 21. The other edge portions of the cover plates are folded on themselves .as at 22, abutting against the side plates so as to prevent their 4lateral movement. ,Preferably the side plates, cover plates, and tread forming strips are secured 'together as by spot welding so that theywill function as an'integral u nit during the use of the mold. 4L

Secured as by spot welding to flanges "11 are plates 23 having inwardly extending flanges 24 joined together by clips 25 similar to clips 20 previously described. Plates ASSIGNOE To yTHE risk RUBBER MASSACHUSETTS, vA CORPORATION `or MASSACHU- 23 also have outwardly extending flanges 26 which serve to support the several molds on eachother in stack formation, if they are to be piled in a heater. The airbag 27, by whichfinternal fluid pressure is Supplied to the tire, is located within the tire when the latter `is assembled' in the mold and preferably has al neck portion 28 extend`- in'g between anges 1l. The stem 28 ofthe airbag passes through suitable/grooves in the flanges 24 as indicated in Fig. 1. To permit of the drainage ofcondensed moisture, which might otherwise settle in the gutter like portions of the side of the mold, holes29 are` provided at intervals around the circumference adjacent to the juncture of plates 10 and.the refolded portion 22 of the cover plates/18. `Similar holes 30 are provided near the juncture of `plates 23 with the side plates 10.

It will be seen that the mold above described may be constructed entirely of sheet metal, being formed. in two mating annular halves, each comprising Several elements permanently secured together during the manufacture of the mold. Machine workin forming the mold is reduced to a,

The punchto lie-manufactured, or by the desires of the 4mold maker, within the scope of the following claims. As an example of changes in the specific embodiment which may be plateyliaijing an outwardly extending flange adapted' for use in retaining the mold halves assembled and refolded 'portions contacting Wit-li the side plates to yhold them in position, said lthree above-mentioned plates be-f ing secured permanently together in a unit, flanges on the side plates adapted to underlie the tire beads, ring plates secured to the underlying flanges and provided with an inwardly directed flange adapted to cooperate with Ka: similar flange on the other mold section to hold the mold sections assembled and' with an outwardly directed flange adapted to support the. molds in stack formation, and devices for cooperating With the' parts describedholding the mold halves plate,a perforated tread forming plate, and

`a cover plate overlying the tread forming plate, having an outwardly-extendin kflange adapted for use in retaining the moldY halves assembled and ref olded portions-contacting with the Aside plates to hold them in position, said three `yabove-mentioned plates being securedfpermanently together in a unit.

3.f A mold adapted for use'in tlie vulcani- Zation of tire casings, constructed in mating 'annular halves each comprising a side plate curved to fit the side ofI the tire, a tread forming strip extending from the side plate toward the central plane of the mold, a cover plate overlying the tread forming strip and `having means for attachment to a similar plate on the other mold half,` and an abutment on the cover plate serying to hold the side plate yagainst outwardmovement, said side plate, tread strip, and cover plate being secured permanently to each other.

4. A mold adapted for use in the vulcanizatiori of tire casings, constructed in Inating annular halves each comprising a. side plate curved to fit the side of the tire, a tread forming `strip extending from the side plate toward the central plane of the inold, and a cover late overlying the tread forming strip, said) side plate, tread strip,

and cover plate being secured permanently` to each other. ,l

THOMAS MIDGLEY. 

